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<a class="reference internal" href="../index.html">
two
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<li class="toctree-l1 has-children"><a class="reference internal" href="../demarrage/index.html">Démarrage</a><details><summary><span class="toctree-toggle" role="presentation"><i class="fa-solid fa-chevron-down"></i></span></summary><ul>
<li class="toctree-l2"><a class="reference internal" href="../demarrage/installation.html">Installation d’un hyperviseur</a></li>
<li class="toctree-l2"><a class="reference internal" href="../demarrage/premier-vpc.html">Premier VPC, premier subnet, première VM</a></li>
</ul>
</details></li>
<li class="toctree-l1 has-children"><a class="reference internal" href="../deploiement/index.html">Déploiement d’un cluster</a><details><summary><span class="toctree-toggle" role="presentation"><i class="fa-solid fa-chevron-down"></i></span></summary><ul>
<li class="toctree-l2"><a class="reference internal" href="../deploiement/architecture-cluster.html">Architecture du cluster</a></li>
<li class="toctree-l2"><a class="reference internal" href="../deploiement/image-qcow2.html">Construction de l’image qcow2</a></li>
<li class="toctree-l2"><a class="reference internal" href="../deploiement/routeurs.html">Routeurs</a></li>
<li class="toctree-l2"><a class="reference internal" href="../deploiement/premier-hyperviseur.html">Premier hyperviseur</a></li>
<li class="toctree-l2"><a class="reference internal" href="../deploiement/route-reflector.html">VM route reflector</a></li>
</ul>
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<p aria-level="2" class="caption" role="heading"><span class="caption-text">Exploitation</span></p>
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<li class="toctree-l1 has-children"><a class="reference internal" href="../exploitation/index.html">Exploitation</a><details><summary><span class="toctree-toggle" role="presentation"><i class="fa-solid fa-chevron-down"></i></span></summary><ul>
<li class="toctree-l2"><a class="reference internal" href="../exploitation/configuration.html">Configuration</a></li>
<li class="toctree-l2"><a class="reference internal" href="../exploitation/services.html">Services systemd</a></li>
<li class="toctree-l2 has-children"><a class="reference internal" href="../exploitation/api-agent/index.html">API de l’agent</a><details><summary><span class="toctree-toggle" role="presentation"><i class="fa-solid fa-chevron-down"></i></span></summary><ul>
<li class="toctree-l3"><a class="reference internal" href="../exploitation/api-agent/asynchronisme.html">Modèle asynchrone et codes de retour</a></li>
<li class="toctree-l3"><a class="reference internal" href="../exploitation/api-agent/reference.html">Référence</a></li>
</ul>
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<li class="toctree-l2"><a class="reference internal" href="../exploitation/observabilite.html">Observabilité</a></li>
<li class="toctree-l2"><a class="reference internal" href="../exploitation/diagnostic.html">Diagnostic</a></li>
</ul>
</details></li>
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<p aria-level="2" class="caption" role="heading"><span class="caption-text">Interne</span></p>
<ul class="current nav bd-sidenav">
<li class="toctree-l1 current active has-children"><a class="reference internal" href="index.html">Concepts</a><details open="open"><summary><span class="toctree-toggle" role="presentation"><i class="fa-solid fa-chevron-down"></i></span></summary><ul class="current">
<li class="toctree-l2"><a class="reference internal" href="vpc-subnet-vm.html">VPC, subnet et VM</a></li>
<li class="toctree-l2"><a class="reference internal" href="modes-reseau.html">Modes réseau</a></li>
<li class="toctree-l2 current active"><a class="current reference internal" href="#">Cycle de vie des ressources</a></li>
<li class="toctree-l2"><a class="reference internal" href="metadata-cloud-init.html">Metadata et cloud-init</a></li>
</ul>
</details></li>
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<h1>Cycle de vie des ressources</h1>
<!-- Table of contents -->
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<h2> Contenu </h2>
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<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#suppression">Suppression</a></li>
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#pas-de-rollback">Pas de rollback</a></li>
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#etats-transitoires-au-redemarrage-de-l-agent">États transitoires au redémarrage de l’agent</a></li>
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<section id="cycle-de-vie-des-ressources">
<h1>Cycle de vie des ressources<a class="headerlink" href="#cycle-de-vie-des-ressources" title="Lien vers cette rubrique">#</a></h1>
<p>VPC, subnets et VM partagent le même jeu d’états.</p>
<pre class="mermaid">
stateDiagram-v2
[*] --&gt; creating
creating --&gt; running
creating --&gt; error
running --&gt; deleting
running --&gt; error
deleting --&gt; deleted
deleting --&gt; error
error --&gt; deleting
deleted --&gt; [*]
</pre><div class="pst-scrollable-table-container"><table class="table">
<colgroup>
<col style="width: 15.0%" />
<col style="width: 85.0%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>État</p></th>
<th class="head"><p>Signification</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">creating</span></code></p></td>
<td><p>la demande est acceptée et enregistrée ; <code class="docutils literal notranslate"><span class="pre">Execute</span></code> n’a pas encore abouti</p></td>
</tr>
<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">running</span></code></p></td>
<td><p>la ressource existe sur le système</p></td>
</tr>
<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">error</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">Execute</span></code> a échoué ; état <strong>terminal</strong>, il n’y a pas de reprise automatique</p></td>
</tr>
<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">deleting</span></code></p></td>
<td><p>suppression en cours</p></td>
</tr>
<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">deleted</span></code></p></td>
<td><p>suppression terminée</p></td>
</tr>
</tbody>
</table>
</div>
<section id="suppression">
<h2>Suppression<a class="headerlink" href="#suppression" title="Lien vers cette rubrique">#</a></h2>
<p>Elle n’est autorisée que depuis <code class="docutils literal notranslate"><span class="pre">running</span></code> ou <code class="docutils literal notranslate"><span class="pre">error</span></code> — sinon <strong>409</strong>. Depuis <code class="docutils literal notranslate"><span class="pre">error</span></code>, elle
est <strong>best-effort</strong> : les ressources système peuvent n’avoir été créées que partiellement.</p>
<p>Un VPC ne peut être supprimé qu’une fois tous ses subnets supprimés.</p>
</section>
<section id="pas-de-rollback">
<h2>Pas de rollback<a class="headerlink" href="#pas-de-rollback" title="Lien vers cette rubrique">#</a></h2>
<p>En cas d’échec partiel pendant une création, les ressources réseau déjà créées <strong>ne sont pas
nettoyées</strong>. C’est un choix délibéré : le nettoyage est déclenché explicitement par une
suppression, qui est justement autorisée depuis <code class="docutils literal notranslate"><span class="pre">error</span></code>.</p>
<p>Conséquence pour l’appelant : après un passage en <code class="docutils literal notranslate"><span class="pre">error</span></code>, émettre un <code class="docutils literal notranslate"><span class="pre">DELETE</span></code> avant toute
tentative de recréation, faute de quoi la recréation butera sur des objets système résiduels.</p>
</section>
<section id="etats-transitoires-au-redemarrage-de-l-agent">
<h2>États transitoires au redémarrage de l’agent<a class="headerlink" href="#etats-transitoires-au-redemarrage-de-l-agent" title="Lien vers cette rubrique">#</a></h2>
<p>La file d’attente des workers est <strong>en mémoire</strong>. Une ressource restée en <code class="docutils literal notranslate"><span class="pre">creating</span></code> ou
<code class="docutils literal notranslate"><span class="pre">deleting</span></code> au moment d’un arrêt de l’agent est donc nécessairement orpheline : plus personne
ne la traite.</p>
<p>Au démarrage, une migration idempotente bascule ces ressources en <code class="docutils literal notranslate"><span class="pre">error</span></code>, et traduit
l’ancien vocabulaire d’états. Une ressource retrouvée en <code class="docutils literal notranslate"><span class="pre">error</span></code> après un redémarrage n’a donc
pas forcément échoué techniquement — elle peut simplement avoir été interrompue.</p>
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